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The open-source tool for building high-quality datasets and computer vision models

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Nothing hinders the success of machine learning systems more than poor quality data. And without the right tools, improving a model can be time-consuming and inefficient.

FiftyOne supercharges your machine learning workflows by enabling you to visualize datasets and interpret models faster and more effectively.

Use FiftyOne to get hands-on with your data, including visualizing complex labels, evaluating your models, exploring scenarios of interest, identifying failure modes, finding annotation mistakes, and much more!

You can get involved by joining our Slack community, reading our blog on Medium, and following us on social media:

Slack Medium Twitter LinkedIn Facebook


You can install the latest stable version of FiftyOne via pip:

pip install fiftyone

Consult the installation guide for troubleshooting and other information about getting up-and-running with FiftyOne.


Dive right into FiftyOne by opening a Python shell and running the snippet below, which downloads a small dataset and launches the FiftyOne App so you can explore it:

import fiftyone as fo
import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart")
session = fo.launch_app(dataset)

Then check out this Colab notebook to see some common workflows on the quickstart dataset.

Note that if you are running the above code in a script, you must include session.wait() to block execution until you close the App. See this page for more information.


Full documentation for FiftyOne is available at In particular, see these resources:


Check out the fiftyone-examples repository for open source and community-contributed examples of using FiftyOne.

Contributing to FiftyOne

FiftyOne is open source and community contributions are welcome!

Check out the contribution guide to learn how to get involved.

Installing from source

The instructions below are for macOS and Linux systems. Windows users may need to make adjustments. If you are working in Google Colab, skip to here.


You will need:

  • Python (3.7 or newer)
  • Node.js - on Linux, we recommend using nvm to install an up-to-date version.
  • Yarn - once Node.js is installed, you can install Yarn via npm install -g yarn
  • On Linux, you will need at least the openssl and libcurl packages. On Debian-based distributions, you will need to install libcurl4 or libcurl3 instead of libcurl, depending on the age of your distribution. For example:
# Ubuntu
sudo apt install libcurl4 openssl

# Fedora
sudo dnf install libcurl openssl


We strongly recommend that you install FiftyOne in a virtual environment to maintain a clean workspace. The install script is only supported in POSIX-based systems (e.g. Mac and Linux).

First, clone the repository:

git clone
cd fiftyone

Then run the install script:

bash install.bash

NOTE: If you run into issues importing FiftyOne, you may need to add the path to the cloned repository to your PYTHONPATH:

export PYTHONPATH=$PYTHONPATH:/path/to/fiftyone

NOTE: The install script adds to your nvm settings in your ~/.bashrc or ~/.bash_profile, which is needed for installing and building the App

NOTE: When you pull in new changes to the App, you will need to rebuild it, which you can do either by rerunning the install script or just running yarn build in the ./app directory.

Upgrading your source installation

To upgrade an existing source installation to the bleeding edge, simply pull the latest develop branch and rerun the install script:

git checkout develop
git pull
bash install.bash

Developer installation

If you would like to contribute to FiftyOne, you should perform a developer installation using the -d flag of the install script:

bash install.bash -d

Source installs in Google Colab

You can install from source in Google Colab by running the following in a cell and then restarting the runtime:


git clone --depth 1
cd fiftyone
bash install.bash

Docker installs

Refer to these instructions to see how to build and run Docker images containing source or release builds of FiftyOne.

UI Development on Storybook

Voxel51 is currently in the process of implementing a Storybook which contains examples of its basic UI components. You can access the current storybook instances by running yarn storybook in /app/packages/components. While the storybook instance is running, any changes to the component will trigger a refresh in the storybook app.


cd /app/packages/components
yarn storybook

Generating documentation

See the docs guide for information on building and contributing to the documentation.


You can uninstall FiftyOne as follows:

pip uninstall fiftyone fiftyone-brain fiftyone-db fiftyone-desktop


Special thanks to these amazing people for contributing to FiftyOne! 🙌


If you use FiftyOne in your research, feel free to cite the project (but only if you love it 😊):

  author={Moore, B. E. and Corso, J. J.},
  journal={GitHub. Note:},